Can you think of any three-dimensional shape that comprises of exactly two surfaces?

Begin with a word, five letters to my name,
Remove the first and last but I am the same
Take out my middle and still, I remain.
What word am I?

Complete the table series riddle by finding the number that can replace "??".

A word I know,
Six letters contain,
Subtract just one,
And twelve is what remains.

If all Goats are Sheep and all Sheep are Deers, are all Deers Goats ?

Which Travels Faster? Solve below famous picture riddle:

Make eight squares by moving only two matchsticks.
Note- Square can be of different sizes.

What type of tree can I carry in my hand?

How can you take 2 from 5 and leave 4?

Can you replace the X (both small and big x) with the numbers between 1 to 19 such that all the rows of 3 numbers between X (big x) sum to 23?